Rockwell Automation 1786-series ControlNet Fiber Media Planning and Installation Guide - Manual (Page 48)

48 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
Chapter 3 Guidelines for Fiber-optic Installation
Aerial Installation
Most round, tight buffer, and loose-tube optical cables are compatible with
helical lashing, clamping, and tied mounting. These cables can be used in aerial
installations by using methods similar to those for electrical cables.
The following procedure describes the stationary method for aerial cable
installation.
1. Use the following tools for aerial placement:
• Adjustable lip clutch winch or equivalent
• Tension monitoring system with continuous readout
• Tow line that assures minimum friction over cable blocks
• A payoff apparatus equipped with a breaking system. The breaking
system can be used to place light tension on the cable during placement.
2. Mount the cable reel into the payoff apparatus so that it pays out from
the top.
3. Determine the direction to pull your cable.
• Pull the cable up-grade whenever possible
• Place the payoff apparatus on an even surface and in-line with the
support strand whenever possible
4. Place cable blocks along the support strand at a distance of no greater than
15 m (50 ft) apart. The first cable block should be placed as close to the
initial pole as possible.
5. Place additional cable blocks:
• One on each side of a corner
• Where distinct vertical clearances are required
6. Guide the cable to a position parallel with the strand as it approaches the
payoff by securing the cable guide to a strand by using a guy clamp on the
strands behind the first roller.
• Place the cable 0.6 m (2 ft) past the pole if the cable should start at a
dead end pole
• Place the first cable block within 0.3 m (1 ft) if the pull starts midstrand
between poles
IMPORTANT Aerial cable must be properly supported using ‘J’ hooks or loops of wire
of sufficient diameter not to damage the fibers due to loading.
IMPORTANT Do not drag fiber-optic cable across or around any obstacles that
may cause outer jacket abrasion.
IMPORTANT Use manila rope (1/4-in., min), kevlar rope, capstan winch rope, or
coated line winch rope as a cable towline.